In forensic anthropology, isotopic analysis is used primarily to inform which aspects of a person's life history?

• A. Determining geographic origin, dietary patterns, and migration history
• B. Estimating time since death directly
• C. Identifying DNA sequence
• D. Predicting age at death from bone length

Answer: (A)

Isotopic analysis examines stable isotopes in human tissues to reveal life-history information tied to where a person lived, what they ate, and how they moved. Different tissues capture different aspects: carbon and nitrogen isotopes in bone collagen reflect long-term diet and trophic level, while oxygen and strontium isotopes in tooth enamel (which forms in childhood and remains relatively stable) chart geographic origin and water sources. This combination lets you trace where someone grew up, their dietary practices, and any migrations over their lifetime.

It isn’t used to estimate time since death directly, since postmortem interval relies on decomposition, insect activity, and tissue changes rather than isotope ratios. It also doesn’t identify DNA sequences, as isotopes provide information about chemistry and environment, not genetics. And it doesn’t predict age at death from bone length, which is determined using skeletal maturation and morphological aging indicators rather than isotopic data.